How Inductor works
The purpose of an inductor is to oppose any change in the magnitude of current within a circuit the electrical property that resists either an increase or decrease in current is known as inductance an inductor is created when an electrical current flows in a wire wrapped around a magnetic core.
You may recognize this as an electromagnet represented by flux lines that develop around the core with the formation of a north and south pole at their respective ends to demonstrate the properties of an inductor we'll add a resistance or light bulb to this circuit as the switch is closed and the current flows through the circuit.
The electromagnetic field in the inductor forms and expands rapidly however because of the unique properties of an inductor as the flux lines of the electromagnetic field expands the changing current generates a voltage that resists the current coming from the source the maximum opposition to current flow occurs at the instant the switch is closed therefore the bulb will not turn on instantaneously however once the electromagnetic field stops expanding based on the level of changing current.
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